sauna device: SHOWDOWN 1
Nov 26, 2025
sauna device: SHOWDOWN 1
The 2nd generation sauna device: "SHOWDOWN 1"
This is the long-awaited new model, significantly updated.
Let's start a new sauna habit to connect with your body!
🚨 [Important] For some models shipped after December 2025, the band specifications and some screen displays will be changed. Please note that there are no changes to the basic functions, specs, or measurement accuracy.
Click here for the update details after December 2025
<Introduction to SHOWDOWN 1>
The "sauna device" for sauna lovers is back and even more powerful as the 2nd generation sauna device: "SHOWDOWN 1"!
The Adult's Science Magazine Special Edition "sauna device", created in collaboration with Gakken, became a huge hit, selling over 20,000 copies!
Designed to withstand high-temperature sauna environments, it displays and records elapsed time and heart rate inside the sauna. By connecting it with the official "Sanokuni" app, this innovative device can quantify your "totonoi".
We incorporated feedback from many sauna device enthusiasts to bring you this major update. It has evolved even further!
An "original design" unique to a dedicated sauna device
- A simple design that lets you see the time, elapsed time, heart rate, and skin temperature at a glance.
- Special waterproofing for peace of mind even in the cold bath.
- Heat-resistant battery that can be used even in hot sauna rooms.
- Designed with privacy in mind, eliminating recording devices such as cameras.
<Basic Experience>
Enter the sauna wearing the sauna device
- Put the sauna device on your wrist, switch to sauna mode, and enter the sauna.
- Inside the sauna room, you can see your heart rate and skin temperature in real time, and always check the elapsed time on your wrist.
- Vibration alerts you when to leave the sauna room based on your pre-set heart rate.
*For models shipped after December 2025, the screen display of the sauna mode may differ slightly from the above. There are no changes to the functions or usage methods.
Connect with the Sanokuni app to see your totonoi in numbers!
- Wear the sauna device and head straight to the sauna room, cold bath, and rest area.
- The measured data is analyzed using 100plus's proprietary algorithm. You can see your totonoi in numbers.
You can record your totonoi (Totonoi Log)
- You can record your totonoi score, Facility information, time spent in the sauna room, cold bath, and rest area all together in the Sanokuni app. You can record and look back on your sauna activities.
- By turning various elements into data, you can compare them with past data, allowing you to explore your "totonoi," such as bathing conditions and compatibility with the Facility.
<Feature Introduction>
There are no changes to how you link with the Sanokuni app or its basic usage.
Even those using the current model can use it immediately.
Here, we will introduce the features of the newly updated watch.
Equipped with Physical Buttons
On the right side of the device, a physical button has been equipped.
In any state of the device, we ensure that unintended decisions are not made.All operations related to "Confirm" are performed using physical buttons.
Operations during sauna mode are basically performed only with physical buttons, and screen touch operations are only required when exiting sauna mode.
We have conducted testing and adjustments to enable smooth sauna recording with fewer operations.
Changes to operations during sauna mode
Simply pressing the physical button once switches to the next Scene.
You can now smoothly change labels without worrying about the screen getting wet.
High-definition large display
An IPS panel allows fordisplaying text and numbers in more vivid colors.
The adoption of a high-definition panel allows you to see even small text clearly, andsignificantly improves visibility.
Contact charging with a magnetic cradle
By changing the charging method,there is no need to attach or detach the band.
The type that attracts with a dedicated magnet ensures you will never get the orientation wrong.
* The dedicated cradle is planned to be sold separately as a standalone item after the release of the main unit.
Soft Silicon Band
Compared to the band of the previous model, changing to a flexible silicon band allows it to fit your wrist more closely.
This helps reduce heart rate data loss and sensor reading errors caused by gaps between the device body and your wrist.
* Replacement bands are planned to be sold separately after the main device is released.
New Heart Rate Sensor
The sensor for measuring heart rate from the previous model has been upgraded to a higher-precision one.
This reduces measurement errors and leads to acquiring more accurate data.
New Skin Temperature Sensor
Compared to the previous model, the skin temperature sensor system has been significantly upgraded.
Sleep Measurement
By wearing the watch when you sleep at night, sleep duration and sleep quality are determined by the watch's algorithm.
Light sleep and deep sleep durations, as well as the proportion of deep sleep, will be displayed.
Specifications, etc.
Device Size: H 4.3 cm × W 2.5 cm × D 1.2 cm
Band Width: Approx. 1.8 cm
Compatible Wrist Size (Strap): 14 cm to 21 cm
Weight: Approx. 26 g
Color: Black
Materials: Case | ABS + Polycarbonate, Strap | Silicone, Display | Tempered Glass
Charging Method: Dedicated Magnetic Cradle (USB-A)
Estimated Charging Time: Approx. 2 hours
Estimated Operating Time: Approx. 5 to 7 days *Depending on usage conditions
Waterproof Rating: IP68, 5ATM
Battery: Equipped with heat-resistant battery
Technical Conformity: 220-JP8190
Package Contents
- sauna device main unit
- Dedicated Strap (Pre-attached)
- Dedicated Charging Cradle
- User Manual
Operation Guarantee & Warranty Period
Operation Guarantee:
- The guaranteed operating temperature is 80°C, the same as the previous model. It cannot be used in sauna environments where the seat surface temperature exceeds 80°C (which corresponds to 95°C on a general sauna temperature display, but varies depending on the location of the thermometer and the seating position), as this may lead to malfunction or accidents.
- As with the previous model, the waterproof performance conforms to IP68, and in addition, it also complies with 5ATM (water pressure resistance).
Warranty Period:
- From the day the sauna device is connected to the "Sanokuni" app, the warranty is valid for 6 months
* We do not guarantee that this device will always operate without trouble or that no errors will occur. Please note that any damage caused by failing to follow instructions regarding the use of this device is not covered by the warranty. Wear and tear from normal use, force majeure, abuse, or damage resulting from the user's intentional act or negligence are not covered by the warranty.
Dedicated App: Sanokuni
The sauna device cannot be used on its own.
It works in conjunction with the dedicated "Sanokuni" app.
By syncing heart rate data with the app, a heart rate graph and "T-Flow Score" will be displayed in your "Totonoi Log".
Supported OS: iOS 16 or higher / Android 12 or higher
